1 . 共享单车已经成为方便人们出行的交通工具,某公司决定从
年
月开始向某地投放共享单车,记第
个月共享单车的投放量和损失量分别为
和
(单位:千辆),其中
,
.从第
个月到
年
月,共享单车的每月投放量比上个月增加
千辆,从
年
月开始,共享单车的每月投放量比上个月减少
千辆;根据预测,从
年
月开始,共享单车的每月损失量比上个月增加
辆.设第
个月底的共享单车的保有量是前
个月的累计投放量与累计损失量的差,则该地区第
个月底的共享单车的估计保有量为___________ 千辆;当
为___________ 时,该地区第
个月底的共享单车估计保有量达到最大.
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